[Xen-ia64-devel] [PATCH 2/5] kexec: improve __cpu_die()

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

[IA64] improve __cpu_die()

use udelay instead of nop loop.
This patch reduces __cpu_die() time much.

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

diff -r b4adb5049860 xen/arch/ia64/linux-xen/smpboot.c
--- a/xen/arch/ia64/linux-xen/smpboot.c Thu Jul 24 14:24:39 2008 +0900
+++ b/xen/arch/ia64/linux-xen/smpboot.c Thu Jul 24 14:24:54 2008 +0900
@@ -748,9 +748,7 @@
                        return;
                }
 #ifdef XEN
-               /* XXX: There must be a better way to sleep */
-               for (int j = 0; j < 1000000; j++)
-                       cpu_relax();
+               udelay(100 * 1000);
 #else
                msleep(100);
 #endif

Attachment: improve-__cpu_die.patch
Description: Text Data

_______________________________________________
Xen-ia64-devel mailing list
Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ia64-devel